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Note 1 - Nature of Business and Basis of Presentation - Adoption of ASC 842 Impact (Details) - USD ($)
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating lease right-of-assets $ 532,757 $ 602,937 $ 0
Prepaid expenses and other 161,997 138,216 150,811
Total assets 11,155,835 12,282,674 11,692,332
Operating lease liabilities, current portion 141,068 135,519 0
Operating lease liabilities, net of current portion 383,028 454,823 0
Total liabilities 3,081,776 1,816,452 1,226,110
Total liabilities and stockholders’ equity $ 11,155,835 12,282,674 $ 11,692,332
Accounting Standards Update 2016-02 [Member]      
Operating lease right-of-assets   602,937  
Prepaid expenses and other   (12,595)  
Total assets   590,342  
Operating lease liabilities, current portion   135,519  
Operating lease liabilities, net of current portion   454,823  
Total liabilities   590,342  
Total liabilities and stockholders’ equity   $ 590,342